Go Back   F150online Forums > F-Series Trucks > 2004 - 2008 F-150
Sign in using an external account
Register Forgot Password?
Register Photos Vin Decoder FAQ Members Search Today's Posts Mark Forums Read VendorsGarage

2004 - 2008 F-150 SPONSORED BY:




Reply
 
 
 
 
Thread Tools Search this Thread Display Modes
  #1  
Old 01-17-2012, 11:05 PM
Senior Member
2004 Ford F-150
 
Join Date: Mar 2007
Location: League City, Texas
Vehicle: 2004 Ford F150
Posts: 1,968
'04 5.4L low speed stalling problem. Idle VERY low.

Sorry I have been so quiet on the truck forums as of late. But on to the issue...

My truck, '04 F150 5.4L 4x4 was left in the driveway a bit too long as I was driving the Saturn for the gas mileage. Well now we need both vehicles, and I got the battery charged back up, oil changed and a fresh tank of gas in it, and am finding that the truck tends to stall once warmed up at low speed such as when approaching a stop sign, or manuvering in a parking lot. I ran a tank through, and filled up adding a quart of Seafoam to the fresh tank. (the pint bottle says treats up to 20 gallons so I figured the 24 ish gallons deserve a quart...).

Anyway since getting it back on the road, I have noticed that once warmed up, the idle is around 350 to 400 rpm...

I am getting no codes.

I have reset the program to stock but the idle remains low.

What else can I be looking at to fix this? I can guarantee that my lovely bride is none too fond of this behavior!

For what it's worth, I am planning on keeping this truck for a good long time... It's paid for!
Reply With Quote
  #2  
Old 01-18-2012, 08:23 AM
Senior Member
Garage is empty, add now
 
Join Date: Sep 2005
Location: NorΩCal - East Bay
Vehicle: 2005 Ford F150
Posts: 1,275
Sounds like the classic dirty throttle body issue. The dropping of the RPMs to the point of stalling are the symptoms I had until I finally cleaned the TB.
Here is a good How To to bench clean the TB:
Bench Clean TB

Before removing the TB, clean it in place. Remove the air cleaner housing and using a clean, lintless rag soaked with WD-40, wipe out the inside of the TB and butterfly valve. It is completely gummed up in there, I suggest removing and cleaning the TB as per the link above.

To clean the mass air flow sensor, try this:
Clean MAF

and finally, I would swap the fuel filter if it wasn't replaced recently.

Good luck!
Reply With Quote
  #3  
Old 01-18-2012, 02:34 PM
Senior Member
2004 Ford F-150
 
Join Date: Mar 2007
Location: League City, Texas
Vehicle: 2004 Ford F150
Posts: 1,968
StoveTop, Thanks for the links... You verified my suspicions...

BTW, love that truck. Just about the perfect stance there...
__________________
Lots of mods. Info on the truck and other outdoor interests http://wildersport-outdoors.blogspot.com info on woodworking, home improvement, and other domestic interests http://daves-workshop.blogspot.com
Reply With Quote
  #4  
Old 01-18-2012, 09:22 PM
Senior Member
2004 Ford F-150
 
Join Date: Mar 2007
Location: League City, Texas
Vehicle: 2004 Ford F150
Posts: 1,968
Okay, worked late this evening, swung by Advance Auto on the way through, grabbed some B12 Chemtool and some MAF Cleaner. I wasn't confident the B12 was MAF safe... I had a little bit of fun tearing the air box down, and honestly the throttle body didn't "look" gunked up, but I shot the snot out of it with the B12, and cleaned up the MAF then reassembled the whole shebang. Now the K&N has about 15K on it since the last cleaning, so it is getting a useful cake, but isn't jammed... Now having reassembled the whole thing, and road tested it, admittedly somewhat briefly, no more stalling, and 650 rpm idle that is smooth...

Go figure...

Tomorrow morning will be the real test, but so far it looks good... I figure once I get it running right with a stock tune, I can take the tuner to it, and tweak some to get my MPG back...
Reply With Quote
  #5  
Old 01-19-2012, 09:45 AM
Senior Member
2004 Ford F-150
 
Join Date: Mar 2007
Location: League City, Texas
Vehicle: 2004 Ford F150
Posts: 1,968
*post morning commute update*

Just FWIW, drove the truck in to work again this morning. Ran smooth as silk, no stalling, no rough idle non of that junk... Thanks folks!

FWIW, I still need to do the filters, I am honestly dreading the fuel filter. One thing I have never liked about Fords is the fuel filter arrangement... But it is what it is...
Reply With Quote
  #6  
Old 01-19-2012, 10:40 AM
Senior Member
Garage is empty, add now
 
Join Date: Sep 2005
Location: NorΩCal - East Bay
Vehicle: 2005 Ford F150
Posts: 1,275
Ah K&N, I bet that's the source of your problems. Those oiled filters can gum up the TB and fubar the MAF. I would consider going back to a paper filter until you replace the K&N. I replaced mine with an AEM filter which is cleanable and reusable like the K&N, but is a dry filter...does not use oil.
Reply With Quote
  #7  
Old 01-19-2012, 10:52 AM
Technical Article Contributor
2002 Ford HD #04417
My Garage
 
Join Date: Apr 2009
Location: tapp'n it
Vehicle: 2002 FORD/HD #04417
Posts: 10,001
Quote:
Originally Posted by dbhost View Post
Okay, worked late this evening, swung by Advance Auto on the way through, grabbed some B12 Chemtool and some MAF Cleaner. I wasn't confident the B12 was MAF safe... I had a little bit of fun tearing the air box down, and honestly the throttle body didn't "look" gunked up, but I shot the snot out of it with the B12, and cleaned up the MAF then reassembled the whole shebang. Now the K&N has about 15K on it since the last cleaning, so it is getting a useful cake, but isn't jammed... Now having reassembled the whole thing, and road tested it, admittedly somewhat briefly, no more stalling, and 650 rpm idle that is smooth...

Go figure...

Tomorrow morning will be the real test, but so far it looks good... I figure once I get it running right with a stock tune, I can take the tuner to it, and tweak some to get my MPG back...
hopefully you removed the tb from the intake....
__________________
Reply With Quote
  #8  
Old 01-19-2012, 02:24 PM
Senior Member
2004 Ford F-150
 
Join Date: Mar 2007
Location: League City, Texas
Vehicle: 2004 Ford F150
Posts: 1,968
Quote:
Originally Posted by 88racing View Post
hopefully you removed the tb from the intake....
Gotta ask, why would that matter? The Haynes guide and the Chemtool can both said to clean it on the truck...
Reply With Quote
Old 01-19-2012, 02:24 PM


 
 
 
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are Off



All times are GMT -4. The time now is 10:32 AM.


 
This forum is owned and operated by Internet Brands, Inc., a Delaware corporation. It is not authorized or endorsed by the Ford Motor Company and is not affiliated with the Ford Motor Company or its related companies in any way. FordŽ is a registered trademark of the Ford Motor Company
Contact Us Advertising Privacy Statement Terms of Service Jobs Forum Text Archives
Emails & Contact Details

Search Engine Friendly URLs by vBSEO 3.5.2